ios中如何固定单个viewController的方向？

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
        return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

- (NSUInteger)supportedInterfaceOrientations
{
//    return UIInterfaceOrientationMaskLandscapeLeft;
    return UIInterfaceOrientationMaskLandscapeRight;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationLandscapeRight;
//    return UIInterfaceOrientationPortrait;
}